Catalyst and method for decomposing volatile organic compounds

Abstract

The invention provides a catalyst for decomposing volatile organic compounds. The catalyst comprises a mesoporous material, which has a pore diameter of 2-50 nm and a specific surface area of 600-1000 m2 / g; silver loaded on the mesoporous material, and a transition metal oxide loaded on the mesoporous material; wherein the transition metal oxide is composed of cerium oxide and manganese oxide and accounts for 1 to 30 wt% of the total weight of the catalyst, and the particle size of silver and transition metal oxide is in a range of 2 to 50 nm. The invention further provides a method for decomposing volatile organic compounds.

Description

[0001] This application is a divisional application of an invention patent application with an application date of December 21, 2009, an application number of 200910261911.9, and an invention title of "catalyst and method for decomposing volatile organic compounds". technical field

[0002] The invention relates to a catalyst, in particular to a catalyst and a method for decomposing volatile organic compounds. Background technique

[0003] Air pollution seriously endangers human health and the environment. In order to reduce the harm of pollutants, the EU has set a reduction target for 2020: such as SO 2 , NOx, VOCs, ammonia, and PM2.5 should be reduced by 82%, 60%, 51%, 27%, and 59% respectively compared with 2000. The collection of air pollution charges is one of Taiwan's pollutant reduction strategies. Based on the harmfulness of VOCs, the Environmental Protection Agency has introduced VOCs air pollution fees since 2006, and plans to increase the rate in 2010, which is ...

Examples

Embodiment 1

[0029] [embodiment 1] preparation of catalyst of the present invention (1)

[0030] Using the principle of co-precipitation, in the process of preparing SBA-15, firstly, a surfactant is added to form a mesoporous template, then a metal precursor is added, and then a silicon source is added to form a silver-loaded mesoporous silicon oxide.

[0031] The detailed preparation method is described as follows: add surfactant P123 and concentrated nitric acid in deionized water and stir until completely dissolved, and the weight percentage is 1:3:30. Next, add silver nitrate whose weight is 2 times that of the surfactant and stir until it is completely dissolved, then add TEOS that is 2.1 times the weight of P123 and stir for 20 hours, then stir at 95°C for 48 hours, then filter and wash three times. After drying and heat treatment at 500° C. for 5 hours, mesoporous silicon oxide loaded with 10 wt % silver was formed. The XRD pattern of this silver / SBA-15 catalyst is as figure 1 . ...

Embodiment 2

[0032] [Example 2] The present invention decomposes the effect of gas containing volatile organic compounds (1)

[0033] First, acetone gas of 1,000 ppm is provided. Afterwards, at a reaction temperature of 150-300° C., the acetone gas was contacted with 0.1 gram of the 10 wt % silver / SBA-15 catalyst prepared in [Example 1] to decompose the acetone gas into carbon dioxide and water. The space velocity of acetone gas in contact with the silver / SBA-15 catalyst is 10,000hr -1 .

[0034] The result of decomposing acetone gas in this embodiment shows that the removal efficiency of 95% can be achieved at 250°C.

Embodiment 3

[0035] [embodiment 3] preparation of catalyst of the present invention (2)

[0036] Silver and iron oxide were loaded on SBA-15 by deposition-precipitation method.

[0037]The detailed preparation method is described as follows: add surfactant P123 and stir in 2M hydrochloric acid until completely dissolved, the weight percentage is 1:40. Then, add TEOS whose weight is 2.1 times that of P123 and stir for 24 hours, then stir at 90°C for 24 hours, perform 3 times of filtration and water washing procedures, dry, and heat treat at 500°C for 5 hours to form mesopore silicon oxide SBA -15.

[0038] Add silver nitrate, ferric nitrate and urea in deionized water and stir until completely dissolved, the weight percentage is 1:7:2:200. After that, add SBA-15 whose weight is 1.5 times of silver nitrate, and stir evenly. Add nitric acid dropwise to adjust the pH between 2 and 3. Next, keep the temperature at 90°C, continue stirring for 16 hours, filter and wash three times, dry and he...

[0001] This application is a divisional application of an invention patent application with an application date of December 21, 2009, an application number of 200910261911.9, and an invention title of "catalyst and method for decomposing volatile organic compounds". technical field

[0002] The invention relates to a catalyst, in particular to a catalyst and a method for decomposing volatile organic compounds. Background technique

[0003] Air pollution seriously endangers human health and the environment. In order to reduce the harm of pollutants, the EU has set a reduction target for 2020: such as SO 2 , NOx, VOCs, ammonia, and PM2.5 should be reduced by 82%, 60%, 51%, 27%, and 59% respectively compared with 2000. The collection of air pollution charges is one of Taiwan's pollutant reduction strategies. Based on the harmfulness of VOCs, the Environmental Protection Agency has introduced VOCs air pollution fees since 2006, and plans to increase the rate in 2010, which is ...

Examples

Embodiment 1

[0029] [embodiment 1] preparation of catalyst of the present invention (1)

[0030] Using the principle of co-precipitation, in the process of preparing SBA-15, firstly, a surfactant is added to form a mesoporous template, then a metal precursor is added, and then a silicon source is added to form a silver-loaded mesoporous silicon oxide.

[0031] The detailed preparation method is described as follows: add surfactant P123 and concentrated nitric acid in deionized water and stir until completely dissolved, and the weight percentage is 1:3:30. Next, add silver nitrate whose weight is 2 times that of the surfactant and stir until it is completely dissolved, then add TEOS that is 2.1 times the weight of P123 and stir for 20 hours, then stir at 95°C for 48 hours, then filter and wash three times. After drying and heat treatment at 500° C. for 5 hours, mesoporous silicon oxide loaded with 10 wt % silver was formed. The XRD pattern of this silver / SBA-15 catalyst is as figure 1 . ...

Embodiment 2

[0032] [Example 2] The present invention decomposes the effect of gas containing volatile organic compounds (1)

[0033] First, acetone gas of 1,000 ppm is provided. Afterwards, at a reaction temperature of 150-300° C., the acetone gas was contacted with 0.1 gram of the 10 wt % silver / SBA-15 catalyst prepared in [Example 1] to decompose the acetone gas into carbon dioxide and water. The space velocity of acetone gas in contact with the silver / SBA-15 catalyst is 10,000hr -1 .

[0034] The result of decomposing acetone gas in this embodiment shows that the removal efficiency of 95% can be achieved at 250°C.

Embodiment 3

[0035] [embodiment 3] preparation of catalyst of the present invention (2)

[0036] Silver and iron oxide were loaded on SBA-15 by deposition-precipitation method.

[0037]The detailed preparation method is described as follows: add surfactant P123 and stir in 2M hydrochloric acid until completely dissolved, the weight percentage is 1:40. Then, add TEOS whose weight is 2.1 times that of P123 and stir for 24 hours, then stir at 90°C for 24 hours, perform 3 times of filtration and water washing procedures, dry, and heat treat at 500°C for 5 hours to form mesopore silicon oxide SBA -15.

[0038] Add silver nitrate, ferric nitrate and urea in deionized water and stir until completely dissolved, the weight percentage is 1:7:2:200. After that, add SBA-15 whose weight is 1.5 times of silver nitrate, and stir evenly. Add nitric acid dropwise to adjust the pH between 2 and 3. Next, keep the temperature at 90°C, continue stirring for 16 hours, filter and wash three times, dry and he...

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